11934 Magic Formula

程式碼

#include <stdio.h>
int main(){
    //f(x) = ax^2 + bx + c
    int count=0,a,b,c,d,l,x;
    scanf("%d %d %d %d %d",&a,&b,&c,&d,&l);
    for(int i=1;i<l;i++){
        if((a * i * i + b * i + c) % d == 0){
        count = count + 1;
        }
    }
    printf("%d",count);
    return 0;
}